When you and a buddy are having a threesome with a girl, and you are each sucking on one of her tits. You then take your outside hand, and give each other a high-five above your heads, therefore creating a "steeple" under which you can continue to enjoy the sweet breast meat.

Guy #1 - Yo dude, Jodie and I wanna have a threesome with you, are you in?
Guy #2 - For sure man, as long as we can do the California Steeple.
Guy #1 - Uhh, Duh!